Which is true about isaplpha(ch), where ch is an int that

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Which is true about isaplpha(ch), where ch is an int that can be represented as an unsigned?
```
char or EOF.isalpha(ch) returns
```

1. 0 if ch is not alphabetic
2. Non-zero if ch is alphabetic
3. Both 0 if ch is not alphabetic & Non-zero if ch is alphabetic
4. Non-zero if d is alphabetic
5. None of these

Correct Option: C

Both 0 if ch is not alphabetic & Non-zero if ch is alphabetic